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Conclusion
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We have successfully synthesized two D–A copolymers con-
taining phthalimide or thieno[3,4-c]pyrrole-4,6-dione as the
acceptors. Both polymers showed good solubility, high thermal
stability and a low HOMO level. The OFET measurements
revealed that P1 showed a hole mobility and current on–off ratio
that were both more than one order of magnitude higher than
P2, although the latter was designed to have better coplanarity
than P1. Theoretical calculations were performed to simulate the
structures of the repeating units and oligomers, and results
revealed that P2 indeed demonstrated better coplanarity,
however, disordered main chain conformations were found to
exist in P2 which may be harmful to the interchain p–p stacking
of the polymers and lead to a lower mobility. AFM analysis also
verified that the thin film morphology of P1 was more advan-
tageous for charge transport than P2. In summary, this work
demonstrates that the polymer chain conformation is another
important factor (in addition to coplanarity) for polymers to
show high FET performance.
ꢀ
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Acknowledgements
This work was financially supported by the National Science
Foundation of China.
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